Press loading device



Aug. 26, 1941. H. SAHLIN ETAL PRESS LOADING DEVI CE 5 Sheets-Sheet 1 vFiled Oct. 1, 1940 I INVENTORS'. f/[A/fi) Sim /A/.

Aug. 26, 1941. H. SAHLIN ETAL 3,

PRESS LOADING DEVICE.

Filed 001;. 1, 1940 s Sheets-Sheet s INVENTORS. flzw/Pr Jill/A IM BY(/Ol/IV fi? YOU/V6.

Patented Aug. 26, 1941 ington, Mich., assignors to General MotorsCorporation, Detroit, Mich., a corporation of Delaware ApplicationOctober 1, 1940, Serial No. 359,272

8 Claims.

This invention relates to apparatus for feeding sheet metal blanks topresses. It might be used in its broader aspect for handling other workin connection with other machines, but it is primarily designed to beused for metal stamping presses.

In the drawings:

Fig. 1 is a side elevation of the apparatus connected with a metalstamping press.

Fig. 2 is an end elevation of the same.

Figs. 3 and 4 are sections on the corresponding section lines of Fig. 1.

Fig.5 is an elevation similar to Fig. 1 but showing the table raised toslide the work in between the dies of a press.

.The ram of the press is designated I, the bed 2, the male die 3 and thefemale die 4. The female die is provided with a portion 5 which forms aknockout for releasing the work from the dies. I The feeding apparatuscomprises a frame 6 which has side plates 1 and legs 8. This frame isprovided with a cross rod 9 on the ends of which are sleeves l whichform fulcrums or pivots for the side walls I I of table l2. This tableis provided with a plurality of rolls i3, mm: on each side. The rollsare supported by theside walls ll of the table. The frame is provided onone side with a dovetail trackway 14 in which a slide l travels. Thisslide [5 has two links [6 and H connected therewith and'these links tiethe dog [8 to the slide [5. Both ends of the dog are beveled. g

The slide is connected by a link IS with ram I of the press. This linkis formed by two telescoping sections. The-section 20 telescopes intothe section 2| and a collar 22 is provided with a set screw 23 foradjusting the length of the link.

On the upstroke of the ram, dog [8 is carried upwardly with the slide bymeans of the shoulder 24. The beveled face 25 of the dog engages roller26 on the table (see Fig. 4). This causes the table to be raised aboutthe pivot. The table is in raised position in Fig. 5. In this positionthe blanks B slide down between the dies by gravity. They are properly.positioned by suitable fingers (not shown) on the bed of the press orthe lower die. When the ram rises as shown in Fig. 5, the roller 26drops off the beveled face 25 of the dog and the flat face 21 engagesthe roller and this holds the table in the elevated inclined positionshown in Fig. 5. The dog is still capable of further upward movement, asshown by the dotted line in Fig. 5.

When it reaches the upward limit the roll 26 drops across the lowerbeveled face 28. This allows the table to drop back to the horizontalposition shown in Fig. 1. When the ram descends as shown in Fig. 1, thebeveled lower face 28 of the latch strikes the roll 26 in its new downward position and this cams the dog to the collapsed position of thelinks shown in Fig. 1, where the links are turned up and the dog issubstantially against the slide. In this position the dog can pass tothe lower side of the roll, as is shown by comparing the full lineshowing of the dog inFig. 1 with the dotted line showing of the dog. Inthe dotted line showing of the dog, the slide or actuator is now inposition to again contact the roll 26 as the slide is lifted and tothereby raise the table.

This device is something like a ratchet in that it is a one wayactuator. but it has an additional function inasmuch as before the fulllength of its stroke has been reached it allows the actuated member tobe released and returned to its initial position by gravity. Thisactuator might be designated more specifically a parallel arm ratchet;This roughly describes its specific characteristics.

The blank is brought to the table by means of the conveyor belt 29 whichcauses it to move on to the rolls. The pivoted finger 30 prevents theblank from overrunning the rolls at the time the blank is first shovedonto the table by means of the conveyor. The finger or limit arm 30 ispivoted, as at 3!, to'the frame 1 of the apparatus. The left hand sideof the finger or limit arm is connected with the pivoted table by pinand slot connection 32. Hence, when the table is lifted this pivot 3|,slot and pin connection 32, serve to actuate the finger to drop it outof position as shown in Fig. 5, so that the work blank B is freely ableto slide between the dies by gravity.

What we claim is:

1. In a blank or other work feeding apparatus for presses or othermachines, the combination of a frame, a table pivoted thereon, normallyresting in substantially horizontal position, and means arranged tocooperate with the machine into which the work blank is to be fed fortilting the table to an inclined position to allow the blank to slideoff the table and into the machine where the operations are to beperformed upon the blank, the said means comprising a draft device thatpicks up the table at one point and after a given tilting of the tablereleases and allows the table to drop.

2. In a blank or other work feeding apparatus forpresses or othermachines, the combination by the machine into which the work is to befed,

and said means comprising a draft device that engages the table when themachine'isoperated and raises one end of the same to a tiltedposiarranged to cooperate with the machine into which the work blank isto be fed for tilting the table to an inclined position to allow theblank to slide off the table and into the machine where the operationsare to be performeed upon the blank, said means arranged to be operatedby a vertically traveling member on the machine into which the work isto be fed and comprising a link slide with an actuating member forengaging the part on the table, the said actuating member comprising ashoulder on the slide and a dog tion and then releases the table andallows the same to drop.- i

3. In a blank or other work feeding apparatus for presses or othermachines, the combination of a frame, a table pivoted thereon, normallyresting in substantially horizontal position, and means arranged tocooperate with the machine into which the work blank is to be fed fortilting the table to an inclined position to allow the blank to slideoff the table and into the machine where the operations are to beperformed upon is blank, said means arranged to be operated by avertically traveling member on the machine into which the work is to: befed, and comprising a draft device provided with elements for engagingthe table to tilt one end of the same as the vertically traveling memberrises and then at a resting in substantially horizontal position, and

means arranged to cooperate with the machine into which the work blankis to be fed for tilting the table to an inclined position to allow theblank to slide off the table and into the machine where the operationsare to be performed upon the blank, said means arranged to: be operatedby a vertically traveling member on the machine into which the work isto be fed and comprising supported on this slide by a pair of parallelarms and having beveled ends which permit the dog to pick up the tablein its upward movement by engaging the part on the table in its upwardmovement and which release the table near the upper end of the stroke ofthe slide and then said dog returns inactively past the part on thetable to its initial position.

"7. In a blank or other work feeding apparatus for presses or othermachines, the combination of :a frame, a table pivoted thereon, normallyresting in substantially horizontal position, and means arranged tocooperate with the machine into which the work blank is to be fed fortilting the table to an inclined position to allow'the blank to slideoff the table and into the machine where the operations'are to beperformed upon the blank, means arrangedto be operated by a verticallytraveling member on the machine into which the work is to be fed andcomprising a link and slide with an actuating member for engaging thepart on the table, the said actuating member comprising a shoulder onthe slide and a dog supported by a pair of parallel arms and havingbeveled ends which permit the dog to pick up the table in its upwardmovement by engaging the part on the table in its upward a link andslide with an actuating member for engaging a part on the table.

5. In a blank or other work feeding apparatus for presses or othermachines, the combination of a frame, a table pivoted thereon andnormally movement and which release the table near the upper end of thestroke of the slide and then said dog returns inactively past said parton the table to its initial position, the said part on the tablecomprising a roll that contacts with the beveled ends and also theintervening surface between the resting in substantially horizontalposition, and I I beveled ends on the dog,

8. Ina blank or other work feeding apparatus for presses or othermachines, the combination of a 'frame, a table pivoted thereon, normallyresting in substantially horizontal position, and

- means arranged to cooperate with the machine the operations are to beperformed upon the li blank, means arranged to be operated by avertically traveling member on the machine into which the work is to befed comprising a link and slide with an actuating member for engaging apart on the table, said actuating member comprising a dog arranged toengage the part on the table and collapse and return to its initialposi- 7 into which the work blank is to be fed for tilting the table toan inclined position to allow the blank to slide off the table and intothe machine where the operations'are to be performed upon the blank,said means arranged to be operated by the machine into which the work isto be fed, and a limit arm, pivoted to said frame and also having acontacting connection with said tilted table sothat as the said tabletilts-with respect to the frame, the limit arm is swung out of'the wayto permit the work to slide down between the dies.

' HENRY SAHLIN.

JOHN R. YOUNG.

